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Python insert numpy array into sqlite3 database

Thoughtful Tiger answered on January 29, 2023 Popularity 1/10 Helpfulness 1/10

answer Python insert numpy array into sqlite3 database

Python insert numpy array into sqlite3 database

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import sqlite3
import numpy as np
import io

def adapt_array(arr):
    """
    http://stackoverflow.com/a/31312102/190597 (SoulNibbler)
    """
    out = io.BytesIO()
    np.save(out, arr)
    out.seek(0)
    return sqlite3.Binary(out.read())

def convert_array(text):
    out = io.BytesIO(text)
    out.seek(0)
    return np.load(out)


# Converts np.array to TEXT when inserting
sqlite3.register_adapter(np.ndarray, adapt_array)

# Converts TEXT to np.array when selecting
sqlite3.register_converter("array", convert_array)

x = np.arange(12).reshape(2,6)

con = sqlite3.connect(":memory:", detect_types=sqlite3.PARSE_DECLTYPES)
cur = con.cursor()
cur.execute("create table test (arr array)")

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Contributed on Jan 29 2023

Thoughtful Tiger

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